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    Oil and vinegar on glass plate against white background. — Stock Photo
    Oil and vinegar on glass plate against white background.
    Chinese college students chatting in front of university building — Stock Photo
    Chinese college students chatting in front of university building
    Abstract male head and neck bones, computer illustration. — Stock Photo
    Abstract male head and neck bones, computer illustration.
    3d illustration of a ribosome (purple), the site of protein synthesis, producing a polypeptide chain (blue). This process is known as translation. — Stock Photo
    3d illustration of a ribosome (purple), the site of protein synthesis, producing a polypeptide chain (blue). This process is known as translation.
    Male anatomy showing Infraspinatus muscle, computer illustration. — Stock Photo
    Male anatomy showing Infraspinatus muscle, computer illustration.
    Junior high students leaving school building, descending steps — Stock Photo
    Junior high students leaving school building, descending steps
    Portrait happy young woman with Down Syndrome working kitchen — Stock Photo
    Portrait happy young woman with Down Syndrome working kitchen
    Father helping teenage son doing his homework in room — Stock Photo
    Father helping teenage son doing his homework in room
    Curious boy looking at face in science center — Stock Photo
    Curious boy looking at face in science center
    Student writing in book — Stock Photo
    Student writing in book
    Father sitting by daughter — Stock Photo
    Father sitting by daughter
    Elementary school children asleep and bored in classroom — Stock Photo
    Elementary school children asleep and bored in classroom
    Chinese father and siblings talking in front of car with mother — Stock Photo
    Chinese father and siblings talking in front of car with mother
    Teenage girl experimenting on microscope in laboratory at university — Stock Photo
    Teenage girl experimenting on microscope in laboratory at university
    Students looking at a molecular structure — Stock Photo
    Students looking at a molecular structure
    Transparent human silhouette with colored larynx, computer illustration. — Stock Photo
    Transparent human silhouette with colored larynx, computer illustration.
    From above unrecognizable young female with curly hair lying on bed reading book during weekend at home — Stock Photo
    From above unrecognizable young female with curly hair lying on bed reading book during weekend at home
    Cute girl sitting at table and reading book at home — Stock Photo
    Cute girl sitting at table and reading book at home
    Female silhouette with detailed liver on grey background, computer illustration. — Stock Photo
    Female silhouette with detailed liver on grey background, computer illustration.
    Side view of cheerful girl hugging unrecognizable elderly grandmother while sitting at table and reading book together in light kitchen in daytime — Stock Photo
    Side view of cheerful girl hugging unrecognizable elderly grandmother while sitting at table and reading book together in light kitchen in daytime
    Male student with hand on chin during lecture with other students in background — Stock Photo
    Male student with hand on chin during lecture with other students in background
    Little kid standing at blackboard — Stock Photo
    Little kid standing at blackboard
    Male anatomy showing Peroneus longus muscle, computer illustration. — Stock Photo
    Male anatomy showing Peroneus longus muscle, computer illustration.
    Teacher and students video conferencing during COVID-19 quarantine — Stock Photo
    Teacher and students video conferencing during COVID-19 quarantine
    Top view of various models of dental jaws with caries and missing teeth in white container used for training of dentistry students — Stock Photo
    Top view of various models of dental jaws with caries and missing teeth in white container used for training of dentistry students
    Man laughing in audience indoors — Stock Photo
    Man laughing in audience indoors
    Portrait from above confident junior high boy student using computer in computer lab — Stock Photo
    Portrait from above confident junior high boy student using computer in computer lab
    3d rendered illustration of human knee on white background. — Stock Photo
    3d rendered illustration of human knee on white background.
    Illustration of colored liver in human body silhouette. — Stock Photo
    Illustration of colored liver in human body silhouette.
    Realistic structure of female musculature, computer illustration. — Stock Photo
    Realistic structure of female musculature, computer illustration.
    Male anatomy showing Orbicularis oris muscle, computer illustration. — Stock Photo
    Male anatomy showing Orbicularis oris muscle, computer illustration.
    Friends reading book — Stock Photo
    Friends reading book
    Cool teenage girls with boom box enjoying dance class in studio — Stock Photo
    Cool teenage girls with boom box enjoying dance class in studio
    Teenage boy making drawing of tree on slate outdoors — Stock Photo
    Teenage boy making drawing of tree on slate outdoors
    Young woman holding mobile phone — Stock Photo
    Young woman holding mobile phone
    Collage of schoolgirl studying — Stock Photo
    Collage of schoolgirl studying
    Illustration of hip joint in human skeleton on black background. — Stock Photo
    Illustration of hip joint in human skeleton on black background.
    Happy college students talking in corridor — Stock Photo
    Happy college students talking in corridor
    Abstract male shoulder bones, computer illustration. — Stock Photo
    Abstract male shoulder bones, computer illustration.
    Hands holding papers at table — Stock Photo
    Hands holding papers at table
    Young female student — Stock Photo
    Young female student
    Male high school teacher leading lesson at projection screen in classroom — Stock Photo
    Male high school teacher leading lesson at projection screen in classroom
    Mid section of man sitting on staircase with notebook and browsing smartphone — Stock Photo
    Mid section of man sitting on staircase with notebook and browsing smartphone
    Female anatomy with orange colored small intestine, digital illustration. — Stock Photo
    Female anatomy with orange colored small intestine, digital illustration.
    Low section of group of conservation volunteers cleaning up river in the countryside, bags of collected rubbish in front of them. Ecology and social responsibility in rural environment. — Stock Photo
    Low section of group of conservation volunteers cleaning up river in the countryside, bags of collected rubbish in front of them. Ecology and social responsibility in rural environment.
    Portrait male speaker with microphone talking on stage — Stock Photo
    Portrait male speaker with microphone talking on stage
    Teacher teaching girl — Stock Photo
    Teacher teaching girl
    Anatomy of human skeleton hand bones, computer illustration. — Stock Photo
    Anatomy of human skeleton hand bones, computer illustration.
    Female freelancer using laptop in courtyard — Stock Photo
    Female freelancer using laptop in courtyard
    Female community college students reviewing paperwork in classroom — Stock Photo
    Female community college students reviewing paperwork in classroom
    Side view of unrecognizable man sitting on staircase and writing in notebook. — Stock Photo
    Side view of unrecognizable man sitting on staircase and writing in notebook.
    Portrait close up of a young African schoolgirl leaning on her desk, looking to camera and smiling while writing in her notebook during a lesson in a township elementary school classroom. — Stock Photo
    Portrait close up of a young African schoolgirl leaning on her desk, looking to camera and smiling while writing in her notebook during a lesson in a township elementary school classroom.
    Happy students walking on street — Stock Photo
    Happy students walking on street
    Blond boy sitting with book — Stock Photo
    Blond boy sitting with book
    Thoughtful woman with book standing in the library — Stock Photo
    Thoughtful woman with book standing in the library
    Smiling teenagers studying — Stock Photo
    Smiling teenagers studying
    Female fashion designers drawing sewing pattern in studio — Stock Photo
    Female fashion designers drawing sewing pattern in studio
    Illustration of shoulder bones in human skeleton. — Stock Photo
    Illustration of shoulder bones in human skeleton.
    Senior Caucasian chef cutting cooking ingredients, with young Caucasian chef standing by him, looking at each other, with other chefs cooking in the foreground. — Stock Photo
    Senior Caucasian chef cutting cooking ingredients, with young Caucasian chef standing by him, looking at each other, with other chefs cooking in the foreground.
    Man drinking coffee on city street — Stock Photo
    Man drinking coffee on city street